lora-project/server-api/route/api/MsgManager/index.js

// const fs = require('fs')
// const path = require('path')

class MsgManager {
  constructor () {
    this.errs = {}
    this.defLang = 'zh'
    let err = require(`./language/zh`)
    this.errs['zh'] = err
  }

  checkLang (lang = '') {
    let lng = this.defLang
    if (typeof lang === 'string' && lang.trim().length > 0) {
      let l = lang.split(',')
      if (l.length > 0) {
        let tmp = l[0].substring(0, 2)
        if (tmp.trim().length > 0) lng = tmp
      }
    }

    if (!(lng in this.errs)) {
      try {
        let errs = require(`./language/${lng}`)
        this.errs[lng] = errs
      } catch (err) {
        lng = this.defLang
      }
    }
    return lng
  }

  getMsg (code, lang = '') {
    let lng = this.checkLang(lang)

    return this.errs[lng][code] || 'errorCode not found'
  }

  getMailTemplate (type, lang = '') {
    let lng = this.checkLang(lang)

    return this.errs[lng]['mail'][type] || {}
  }
}

module.exports = new MsgManager()